tomcat 之 session服务器 （memcache)

#: 在tomcat各节点安装memcached

[root@node1 ~]# yum install memcached -y

#: 下载tomcat所需的jar包（此处在视频中找软件）

[root@node1 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/2.3.2/memcached-session-manager-2.3.2.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc8/2.3.2/memcached-session-manager-tc8-2.3.2.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/net/spy/spymemcached/2.12.3/spymemcached-2.12.3.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/msm-kryo-serializer/2.3.2/msm-kryo-serializer-2.3.2.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/kryo-serializers/0.45/kryo-serializers-0.45.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/com/esotericsoftware/kryo/3.0.3/kryo-3.0.3.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/com/esotericsoftware/minlog/1.3.1/minlog-1.3.1.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/org/ow2/asm/asm/5.2/asm-5.2.jar
[root@node1 ~]# wget http://repo1.maven.org/maven2/org/objenesis/objenesis/2.6/objenesis-2.6.jar

#：将jar包拷贝到lib目录下

[root@node1 ~]# cp -r *.jar /usr/local/tomcat/lib/

#：修改配置

[root@node1 ~]# vi /usr/local/tomcat/conf/context.xml
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>
    <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
        memcachedNodes="n1:192.168.5.101:11211,n2:192.168.5.102:11211"
        failoverNodes="n1"
        requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
        transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"/>

[root@node2 ~]# vim /usr/local/tomcat/conf/context.xml
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>
    <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
        memcachedNodes="n1:192.168.5.101:11211,n2:192.168.5.102:11211"
        failoverNodes="n2"
        requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
        transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"/>

注意：这个Mem是交叉存储，1存到2上，2存到1上。 当2的mem挂掉后，1的才会存到1上。每个tomcat本身也有session,当自己没有的时候才会在mem上查找

#：将所有jar包给节点2拷贝一份
[root@node1 ~]# scp -r /usr/local/tomcat/lib/*.jar 192.168.5.102:/usr/local/tomcat/lib/

#：启动
#：测试

non-sticky模式
原理
从msm 1.4.0之后开始支持non-sticky模式。
Tomcat session为中转Session，n1为主session，n2为备session。产生的新的Session会发送给主、备memcached，并清除本地Session。
n1下线，n2转正。n1再次上线，n2依然是主Session存储节点。

#配置tomcat

[root@node1 tomcat]# vim conf/context.xml
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
        memcachedNodes="n1:192.168.5.101:11211,n2:192.168.5.102:11211"
        sticky="false"
        sessionBackupAsync="false"
        lockingMode="uriPattern:/path1|/path2"
        requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"
/>

#：测试

redis配置（注意此处的lib库中之安装redis相关的就可以，不用安装tomcat相关的）

#：下载redis

[root@node1 tomcat]# yum install redis -y

#:修改Redis监听地址

[root@node1 tomcat]# vim /etc/redis.conf
bind 0.0.0.0

#：修改配置文件（后端所有tomcat指向同一个Redis）

[root@node1 tomcat]# vim conf/context.xml
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager" 
        memcachedNodes="redis://192.168.5.101:6379"
        sticky="false"
        sessionBackupAsync="false" 
        lockingMode="uriPattern:/path1|/path2"
        requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" 
        transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"
/>